5.Sylosis-Monolith
Easily the most underrated record of 2012 by far in my book. Sylosis came out of nowhere to release a melodic death/thrash/progressive metal masterpiece. This has been a band I had heard about a couple of years ago, but slept on until they were announced to be opening for Lamb of God on their fall tour. Since I was going to the see them live, I figured I'd check them out and I'm so glad I did (Although I kind of hated myself for waiting so long to do so.) Their unique combination of styles make for some interesting tracks. You have everything here from vintage thrash riffs and fret-melting solos, melodic guitar work, and even the occasional, well-used clean vocal line and breakdown. Vocalist/lead guitarist Josh Middleton is one talented bastard who can shred as well as deliver incredible vocals that are very much rooted in old-school Gothenburg melodic death metal. This album is masterfully crafted all-around and if your looking for some good thrash/melodic death/progressive/(somewhat) metalcore than look no further than Sylosis.

Side Note: The cover art is without a doubt my favorite of 2012. It reminded me a lot of John Baizley's work and I was actually surprised that he didn't do it. Kudos to Dan Goldsworthy for creating a badass and beautiful album cover.

Standout Tracks
1.Out from Below
2.What Dwells Within
3.Fear the World

And to finish up the thread, here are my top 50 songs of 2012 in no particular order:
3 Inches of Blood-Leave it on the Ice
Aesop Rock-Gopher Guts
As I Lay Dying-Wasted Words
Between The Buried and Me-Bloom
Between The Buried and Me-Lay Your Ghosts to Rest
Between The Buried and Me-Slight Flight Parliament
Between The Buried and Me-Telos
Big K.R.I.T-Boobie Miles
Brother Ali-Mourning in America
Cattle Decapitation-The Carbon Stampede
Coheed and Cambria-Key Entity Extraction I: Domino the Destitute
Coheed and Cambria-Key Entity Extraction III: Vic the Butcher
Converge-Sadness Comes Home
Death Grips-I've Seen Footage
Death Grips-No Love
Death Grips-The Cage
Death Grips-The Fever (Aye Aye)
Deftones-Leathers
Deftones-Poltergiest
Dying Fetus-In the Trenches
Dying Fetus-Invert the Idols
El-P-Tougher Colder Killer ft.Killer Mike & Despot
Every Time I Die-I Suck (Blood)
Every Time I Die-Partying is Such Sweet Sorrow
Every Time I Die-Underwater Bimbos from Outer Space
Frank Ocean-Pyramids
God Forbid-Equilibrium
High on Fire-Fertile Green
High on Fire-Serums of Liao
Hour of Penance-Ascension
Kendrick Lamar-m.A.A.d city
Kendrick Lamar-Sing About Me, I'm Dying of Thirst
Kendrick Lamar-The Art of Peer Pressure
Killer Mike-Go!
Lamb of God-Desolation
Lamb of God-King Me
Macklemore & Ryan Lewis-Can't Hold Us ft.Ray Dalton
Nas-Stay
Parkway Drive-The River
Periphery-Have a Blast
Periphery-Scarlet
Sylosis-Out from Below
Sylosis-What Dwells Within
The Contortionist-Causality
The Faceless-Autotheist Movement I-III
The Faceless-In Solitude
The HAARP Machine-Machine Over
Veil of Maya-The Glass Slide
Whitechapel-Make It Bleed